MAX6431FJUS-T

Overview

The MAX6431FJUS-T is a low-power, dual-level battery monitor with internal hysteresis. It provides two independent low-battery output indicators to signal three distinct battery states: good, weak, and empty. Designed for monitoring single lithium-ion cells or multicell alkaline/NiCd/NiMH power supplies, it asserts the output when voltage drops below a specified threshold and deasserts after rising above a high threshold following a minimum 140ms timeout. This delay ensures supply stabilization before enabling power-converter or microprocessor activity.

Feature Summary

• Dual low-battery output indicators for multi-chemistry cell monitoring
• Internal hysteresis prevents output chatter during voltage fluctuations
• Minimum 140ms timeout period ensures supply voltage stabilization

Applications

• Single lithium-ion (Li+) cell monitoring
• Multicell alkaline power supply supervision
• NiCd/NiMH battery pack management

Procurement Notes

Verify the suffix 'T' indicates tape-and-reel packaging configuration. Confirm the 'FJUS' code corresponds to the specific SOT-143-4 package variant. Ensure compatibility with the target system's voltage thresholds and current consumption requirements before integration.

Selection Notes

Select this component for applications requiring precise detection of weak battery conditions without external resistors. The dual-output architecture allows separate signaling for normal and low-power modes. Verify that the operating temperature range meets environmental specifications.

Part Context

Part of the MAX6427–MAX6438 family of single/dual-level battery monitors. These devices are optimized for portable electronics where low quiescent current and accurate threshold detection are critical for extending battery life and ensuring reliable system shutdown.

Replacement Considerations

Compatible substitutes within the same family include MAX6430FJUS-T and MAX6432FJUS-T. Verify pinout and threshold specifications match the original design requirements.